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Dan Lizarralde examining EK80 echosounder data on a monitor.

Dan Lizarralde examining EK80 echosounder data on a monitor.
Dan Lizarralde examining EK80 echosounder data on a monitor.
Dan Lizarralde examining EK80 echosounder data on a monitor.
Dan Lizarralde examining EK80 echosounder data on a monitor.
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Lubofsky, Evan
Dan Lizarralde examining EK80 echosounder data on a monitor.
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06/12/2016
Dan_Lizarralde.jpg
Image Of the Day caption:
WHOI geophysicist Dan Lizarralde points to a real-time image of the seafloor off Martha's Vineyard, generated by an EK80 echosounder on the research vessel Neil Armstrong. Lizarralde can use the EK80 to look for gas bubblespossible evidence of fresh water seeping into the ocean from the sediments below. On a previous cruise to the same area, WHOI geophysicist Rob Evans used another instrument to map areas of fresh water underneath the seabed: controlled source electromagnetic (CSEM) sounding. Because fresh water is a poor conductor of electricity, Evans and colleagues can use CSEM to distinguish it from salt water.
Caption from Oceanus magazine, Vol. 52, No. 2, pg. 42:
WHOI geophysicist Dan Lizarralde examines data from the research vessel Armstrong's EK80 echosounder, looking for evidence of bubbles seeping from the seafloor.
Photo by Evan Lubofsky
© Woods Hole Oceanographic Institution
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